I would like to override some users'right so that they can retake the quiz again. It is strange that in the list of users to select, I can see a lot of students, more than those enrolled in the course and being able to do the quiz. I observe that if a user has any system role, he / she will show up in the override user list although he / she is not enrolled in that course.
How can I keep user still having a system role but he / she won't show up in the override users list ?
MAny thank for your guide